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Low pressure seal for valve

a low-pressure valve and seal technology, applied in the field of valves and seals for low-pressure valves, can solve the problems of poor contact between water escaping through the ball and the seal, etc., and achieve the effect of increasing sealing conta

Inactive Publication Date: 2015-05-14
SHOVAL MEIR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an improved valve with a hydraulic seal against which a floating member rises to ensure proper sealing even at low pressure heads. The floating member may be a floating ball, but the invention is not limited to a spherical member and may be carried out with other shapes as well. The annular seal includes an inner sealing member and an outer wall, and the floating member rises to press against the annular seal. The invention allows water to rise and flow around the floating member and enter the annular channel to apply hydraulic pressure directed radially inwards against the inner wall of the annular channel to increase sealing contact between the floating member and the annular seal.

Problems solved by technology

A problem with such floating ball anti-flood valves is the contact between the ball and the seal is not very good if the water head is low, such as when the water level rises slowly and not suddenly.
The poor contact between ball and seal can lead to water escaping through between the ball and seal.

Method used

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  • Low pressure seal for valve
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Examples

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Embodiment Construction

[0013]Reference is now made to FIGS. 2-3, which illustrate a hydraulic seal 10 for use with a valve with a floating member (such as, but not limited to, anti-flood valves), constructed and operative in accordance with a non-limiting embodiment of the present invention.

[0014]The seal 10 is an annular (meaning ring-shaped) seal, which made be made of any suitable elastomeric material, such as but not limited to, natural rubber or synthetic rubber, such as EPDM (ethylene propylene diene monomer), butyl, styrene butadiene or neoprene, or a thermoplastic elastomer (e.g., polyurethane or olefin). Seal 10 may be manufactured in a wide variety of outer diameters (D) and inner diameters.

[0015]In the illustrated embodiment, the seal 10 has an inner sealing member 12 which is circular in cross-section, but which may be elliptical, trapezoidal, rectangular, square, U-shaped or other shapes as well. (“Inner” refers to more inner in the radial direction with respect to the center 13 of the ring-s...

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PUM

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Abstract

A valve assembly includes a valve with an annular seal installed therein. The annular seal includes an inner sealing member formed with an annular channel with an open end that faces downwards. The inner sealing member and the annular channel define an annular flap with an outer wall, which is an inner wall of the annular channel. A floating member is arranged to float up and rise with a water level present in a portion of the valve and press against the annular seal.

Description

FIELD OF THE INVENTION[0001]The present invention relates to valves and seals for valves, and particularly to a low pressure valve with a hydraulic seal against which a floating member rises to ensure proper sealing even at low pressure heads, such as for anti-flood valves.BACKGROUND OF THE INVENTION[0002]Anti-flood valves are well known in the art for preventing backwater surges in sewers, drain pipes and the like. They have different constructions and modes of operation. One prior art anti-flood valve is shown in FIG. 1.[0003]The anti-flood valve has a floating ball 1 that floats in water in a pipe housing 2. Nominally, with normal water levels, the floating ball 1 floats on the water level (lower ball). In the event of a flood or other source of backwater, the water level rises and the floating ball 1 rises with the water level until it seats and seals against a seal 3 (upper ball). This prevents backwater from rising through the top of the pipe and thus prevents flooding above t...

Claims

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Application Information

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IPC IPC(8): F16K1/46F16K15/02
CPCF16K15/02F16K1/465E03F5/042E03C1/288Y10T137/7837
Inventor SHOVAL, MEIR
Owner SHOVAL MEIR